Yes, the word "uterus" does have a plural form, and it is "uteri." English, with its history of borrowing from different languages, often inherits their rules too. "Uterus" is one of those words that's been plucked from Latin, and it follows Latin grammar rules for plurals. Thereby, when you have more than one uterus, you have "uteri". But mind you, it's not common in everyday language; it's more used in medical or scientific communities. The same rule applies to other Latin-origin words ending in '-us' such as cactus (cacti), fungus (fungi), or nucleus (nuclei). It's these little nuggets that add a dash of spice to the English language, making it a constantly evolving mélange of fascinating rules and exceptions.
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